Carbon-silica composite as an effective support for iron Fischer-Tropsch synthesis catalystsстатья
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Дата последнего поиска статьи во внешних источниках: 3 июля 2019 г.
Аннотация:Carbon-silica composite was prepared by impregnation of silica with aqueous glucose solution followed by drying and calcination in inert atmosphere. This material is proposed as a support for the potassium-promoted iron catalysts for Fischer–Tropsch synthesis. The catalysts were prepared by IWI method. Reducibility of CQ-supported iron is increased and Hägg carbide is formed in the course of activation in CO/H2 flow at 400°C for 2 h. Subsequent exposure in FTS conditions results in the significant increase of iron carbide particles, from 3–4 to 20–30 nm while no such increase was detected for the pure silica as support. The carbon-silica composite support provides a beneficial effect on catalytic activity of iron in CO hydrogenation as well as suppression of methane formation and increasing ASF chain growth parameter. The catalysts were characterized by nitrogen adsorption, XPS, TEM, and in situ magnetic measurements in the course of temperature programmed reduction by H2 and synthesis gas.